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Debt - Additional Information (Detail) - USD ($)
1 Months Ended 6 Months Ended
Apr. 25, 2018
May 31, 2019
Jun. 30, 2020
Dec. 31, 2019
Debt Instrument [Line Items]        
Leverage ratio covenant period     12 months  
Debt     $ 1,013,000,000.0 $ 1,029,100,000
Aggregate principal amount maturing in next twelve months     177,800,000  
Line of Credit | Revolving Credit Facility        
Debt Instrument [Line Items]        
Credit facility maximum borrowing capacity $ 800,000,000.0 $ 900,000,000.0    
Debt term 5 years      
Line of Credit Facility, Increase   $ 100,000,000.0    
Optional line of credit limit increase       300,000,000.0
Credit facility available borrowing capacity       763,500,000
Debt     $ 136,500,000 35,800,000
Average interest rate as of June 30, 2020     1.385%  
Line of Credit | Revolving Credit Facility | Maximum        
Debt Instrument [Line Items]        
Debt covenant, unrestricted cash     $ 250,000,000.0  
Debt agreement financial covenant, leverage ratio     1.00  
EBITDA ratio for debt     3.00  
Line of Credit | Revolving Credit Facility | Minimum        
Debt Instrument [Line Items]        
Debt covenant, unrestricted cash     $ 5,000,000.0  
Debt agreement financial covenant, leverage ratio     3.75  
EBITDA ratio for debt     1.00  
Term Loans | Term Loans, due 2023 [Member]        
Debt Instrument [Line Items]        
Long-term Debt, Gross       200,000,000.0
Debt     $ 200,000,000.0 200,000,000.0
Average interest rate as of June 30, 2020     1.477%  
Commercial Paper        
Debt Instrument [Line Items]        
Commercial paper     $ 0 117,800,000
Senior Notes | Senior Notes 4.500% Due 2029        
Debt Instrument [Line Items]        
Debt     $ 400,000,000.0 $ 400,000,000.0
Average interest rate as of June 30, 2020     4.50%  
Other Credit Facilities [Member]        
Debt Instrument [Line Items]        
Credit facility maximum borrowing capacity     $ 20,900,000  
Borrowings outstanding     $ 0